Moist and unstable air south of a frontal system across North Florida led to the formation of slow-moving showers and thunderstorms across SE Florida during the morning hours of April 15th.
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The episode as NWS MFL wrote it up.
Moist and unstable air south of a frontal system across North Florida led to the formation of slow-moving showers and thunderstorms across SE Florida during the morning hours of April 15th.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Miami, FL wrote its last area forecast discussion before the first event at Apr 15, 6:38 AM EST, 1 hour 31 minutes earlier.
Area Forecast Discussion National Weather Service Miami FL 738 AM EDT Fri Apr 15 2022 .AVIATION(12Z TAFS)... MVFR/IFR conditions will be possible for all terminals today as a line of storms makes its way across South FL this afternoon. Storm coverage will increase from the East Coast in the early afternoon, and progress southwest, impacting APF in the late afternoon hours. Short-fuse amendments could be possible for MIA, TMB and OPF as conditions develop throughout the day. Shower activity should diminish overnight. && .PREV DISCUSSION... (Issued 225 AM EDT Fri Apr 15 2022) SHORT TERM (Today through Saturday)... A cold front will progress into Northern Florida and the adjacent Atlantic waters this morning before stalling and then eventually retreating back northward as we head into the weekend. A mid-lvl impulse will progress eastward along and just south of the low-lvl boundary this morning. Although these features will both remain north of our area, they will help to generate convection over Central Florida and the Gulf Stream, with outflow from these storms combining with the Atlantic sea breeze to generate scattered to numerous showers/thunderstorms over eastern portions of the area this afternoon, with activity generally propagating south-southwestward with time. 500mb temps around -11C will support 6-6.5 C/km 700-500mb lapse rates, and these will overlie pre-convective temperatures in the mid to upper 80s and dewpoints near 70, resulting in ~1500-2000 J/kg of SBCAPE. With adequate DCAPE and steep low-lvl lapse rates gusty winds will be a threat, and with the somewhat cool temperatures aloft hail will also be possible with stronger updrafts. Low-lvl shear will be limited with the light easterly flow being fairly deep (nearly to 700mb), however the flow just above this level will be westerly resulting in 25-30kts of 0-6km shear, which could be enough to support some multicell clusters. Heavy rainfall will also be a threat with 1.6-1.7 inch PWATs and given the somewhat nebulous individual storm motions (resulting from the somewhat unusual wind profile) flooding can’t be ruled out, although the expectation (and hope) is that most of the activity will shift west of the more prone east coast metro areas somewhat rapidly. Activity will wane after sunset and most of Friday night should be dry, apart from maybe a few isolated showers/storms near the east coast/Gulf Stream . Some patchy fog will be possible in the usual areas near and west of the Lake given the light winds and potential antecedent precipitation. Overnight lows will be similar to what we have observed the last few nights, ranging from the mid 60s in the NW to the low-mid 70s near the immediate coast. Saturday looks like another warm and muggy day (i.e. highs mostly mid to upper 80s, dewpoints in the 70s) with continued light synoptic flow. This will favor the sea breezes being the main drivers of convection, with guidance largely suggesting only isolated-scattered coverage, focused over the northern Interior (near the center of the SFL thermal trough). LONG TERM (Saturday Night through Thursday)... The area will remain relatively far south of the stalled sfc front on Sunday resulting in another warm and humid day with temperatures similar to Saturday. Also, similar to Saturday, the convective focus will mostly be the sea breezes with coverage isolated-scattered. On Monday a diffuse shortwave will move over the eastern US and will help induce a weak frontal low to develop along the stalled boundary over the SW Atlantic. This may result in the boundary finally dipping south towards our area, although on the whole we should remain prefrontal Monday with warm/humid conditions and a greater chance of showers/storms relative to the weekend. High Pressure will build to our north starting Tuesday and drier air will begin to filter in, resulting in gradually decreasing precipitation chances. That being said, there could still be some storms on Tuesday, particularly over southern portions of the area as the boundary may take its time to fully clear the area. The High will shift eastward Wednesday/Thursday resulting in a gradual veering of the low-lvl winds from N-NE to easterly. We should be mostly dry with seasonable-slightly below normal temps on Wednesday, with some shower chances returning Thursday over mostly the east coast as streamers could move in from the Atlantic in the easterly regime. MARINE... Generally benign marine conditions will persist through the weekend as E-SE flow weakens and seas remain largely 2 feet or less. However, there will be a chance of locally higher winds and seas in thunderstorms which will be possible each day through early next week. BEACHES... The large-scale E-SE flow will weaken heading into the weekend, dropping the rip current risk to low-moderate over the east coast beaches, while the largely offshore component of the synoptic flow over the Gulf beaches will keep the risk low. && .PRELIMINARY POINT TEMPS/POPS... Miami 73 85 73 86 / 20 20 20 20 West Kendall 71 87 70 87 / 20 20 20 20 Opa-Locka 72 86 72 87 / 20 20 20 20 Homestead 71 85 71 85 / 20 20 20 20 Fort Lauderdale 73 84 73 85 / 30 20 20 20 N Ft Lauderdale 73 83 72 84 / 30 20 20 20 Pembroke Pines 71 85 71 86 / 20 20 20 20 West Palm Beach 71 84 71 84 / 30 20 20 30 Boca Raton 72 84 72 85 / 30 20 20 20 Naples 70 88 71 88 / 30 30 10 20 && .MFL WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. GM...None. && Update/Aviation...ATV Today through Saturday and Marine...Carr Saturday Night through Thursday...Carr Visit us at weather.gov/miami Follow us on Facebook and Twitter at: www.facebook.com/nwsmiami www.twitter.com/nwsmiami
Hazardous Weather Outlook for South Florida National Weather Service Miami FL 417 AM EDT Fri Apr 15 2022 AMZ610-630-650-651-670-671-FLZ063-066>075-168-172>174-GMZ656-657-676- 160230- Lake Okeechobee-Biscayne Bay- Coastal waters from Jupiter Inlet to Deerfield Beach FL out 20 NM- Coastal waters from Deerfield Beach to Ocean Reef FL out 20 NM- Waters from Jupiter Inlet to Deerfield Beach FL from 20 to 60 NM- Waters from Deerfield Beach to Ocean Reef FL from 20 to 60 NM excluding the territorial waters of Bahamas-Glades-Hendry- Inland Palm Beach-Metro Palm Beach-Coastal Collier-Inland Collier- Inland Broward-Metro Broward-Inland Miami-Dade-Metro Miami-Dade- Mainland Monroe-Coastal Palm Beach-Coastal Broward-Coastal Miami- Dade-Far South Miami-Dade- Coastal waters from Chokoloskee to Bonita Beach FL out 20 NM- Coastal waters from East Cape Sable to Chokoloskee FL out 20 NM- Waters from Chokoloskee to Bonita Beach FL from 20 to 60 NM- 417 AM EDT Fri Apr 15 2022 ...MODERATE RISK OF RIP CURRENTS ALONG ATLANTIC BEACHES... ...ISOLATED STRONG THUNDERSTORMS POSSIBLE TODAY... This hazardous weather outlook is for South Florida. .DAY ONE...TODAY AND TONIGHT Rip currents: There is a moderate risk of rip currents along the Atlantic beaches. Thunderstorms: Scattered to numerous showers and thunderstorms will be possible this afternoon. Wind: Strong winds will be possible in the strongest thunderstorms this afternoon. Hail: Hail to the size of quarters will be possible in the strongest thunderstorms this afternoon and early evening. Flooding: Localized flooding will be possible in the thunderstorms this afternoon, particularly near the east coast. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY The elevated risk of rip currents may continue over the weekend for the Atlantic Beaches, although some modest improvement will be possible as the onshore flow begins to decrease going into the upcoming weekend. A few isolated to scattered showers and thunderstorms will be possible this weekend into early next week. The strongest storms may produce strong gusty winds, heavy rainfall, and lightning. .SPOTTER INFORMATION STATEMENT... Widespread spotter activation is not anticipated. For more information...visit the National Weather Service in Miami website at www.weather.gov/miami.
The Miami radar (KAMX), 115 km away, was scanning. The volume nearest the first event began at 13:42 UTC.
1 strong wind, 1 funnel cloud, 1 flash flood. Local standard time, as filed.
WATERSPOUT. Location: 26.738, -80.075. Video received from WPEC-TV of a waterspout on Lake Mangonia. The waterspout did not cause any damage over adjacent land areas.
Picture received from WPTV-TV of a funnel cloud observed from I-95 looking north over the West Palm Beach area.
Significant flooding occurred in West Palm Beach along N. Flagler Drive in the 31st Street area. Several cars stalled due to deep water on the street. A rainfall measurement of 2.36 inches was received in the vicinity, with rainfall estimates of 2.5 to 3 inches in just one hour. Street flooding was also reported on Australian Avenue and 45th Street, with stalled vehicles.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2022Every state in 2022This day in weather historyWarnings in Florida, April 2022
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1021096, 1021097, 1021095.